#include <REGX52.H>

void Delay1ms(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;
	
	while (xms) // 每一个循环1s
	{	
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
}


void main()
{
	while (1)
    {
        P2 = 0xFE; // 1111 1110
		Delay1ms(100);
		P2 = 0xFD; // 1111 1101
        Delay1ms(200);
		P2 = 0xFB; // 1111 1011
        Delay1ms(300);
		P2 = 0xF7; // 1111 0111
        Delay1ms(400);
		P2 = 0xEF; // 1110 1111
        Delay1ms(500);
		P2 = 0xDF; // 1101 1111
        Delay1ms(600);
        P2 = 0xBF; // 1011 1111
		Delay1ms(700);
		P2 = 0x7F; // 0111 1111
		Delay1ms(800);
    }
}